Lifting jack



New. 25

1,516,616 G. w. MEYER LIFTING JACK Filed June 29. 1923 Patented Nov. 25,l24.

'ATES PA-TEN FiCE.

GEORGE w. MEYER, E CINCINNATI, onro, ASSIGNOR OF O E-HALE T0 CHARLES A.

' ROOS, 0F CINCI1\TNATI, 01110.

LIFTING JACK.

Application filed June 29, 1923. Seriall N0.'648,482.

To all whom z't-mizy concern:

Be it known that I, GEORGE W. MEYER, a citizen of the United States,residing at Cincinnati, in the county of Hamilton and State of Ohio,have invented new and useful Improvements in Lifting Jacks, of which thefollowing is a specification.

My invention relates to jacking devices used particularly in thebuilding art to jack up and tighten adjustable shores. It consistsprimarily in an improvement over patent to H. W. Roos No. 1,415,055 andis designed particularl for use with adjustable shores described inpatent to G. W. Meyer and G. A. Roos No. 1,415,602 and those of agenerally similar type.

The principal object of my invention is to provide a device of simpleconstruction for extending or tightening a shore without bending ordamaging the parts thereof.

My invention is illustrated in the accompanying drawings in which: Fig.1 is a top plan view of my improved jacking device,

Fig. 2 is a side elevation of an adjustable shore showing my device inposition for use,

-with one side of the forked lever broken away, and

Fig. 3 is a front elevation of an adjustable shore adapted to beextended by the use of my invention.

Referring now t0 the drawings, particularly to Fig. '3, showing anadjustable shore comprising a relatively fixed stanchion B preferablymade of steel tubing, telescopially engaged with a movable member Acomprisingthe uprights a and a preferably -made of wood and spaced apartin parallel relation'to each-other by the terminal head 6, tie plates aand base plate a The 'tie plates a and base plate a are centrallyperforated, to allow the passage of the stanchion B, therethrough, saidperforated plates acting as guides for said stanchion B.

'An automatic locking device comprising the perforated plate C formedwith upturned sides a is pivoted between the uprights, a and a near thebase plate a and is actuated by the coiled spring S located between theunderside of the plate 0 and the base plate (1 so as to hold the movablemember A infixed relation to the stanchion B when said members A and Bhave been telescopically adjusted.

. Adjustable shores of the above mentioned the exact height by means ofa jacking device ,1

Referring now to the jacking device as shown in Fig. 1. A forkedlever'E' comprising the lever e and the fork arms 6 and e is providedwith a pivot e secured to said arms. A clamping link (2 pierced at itsinner end by the pivot e is provided at its outer end with a groovedclamping edge e. A clamping hook e provided'with a suitable innerclamping surface 6 is looselypivoted to said clamping link e by the studbolt 0 Said link 6 and hook combine to form an eflicient clamp withgripping edges grooved to conform to the shape of the stanchion B of theshore. When it is desired to jack up the shore the hook e and link 6 areplaced in position on the fixed stanchion B- see Fig. 2-the link 6 beingloose on the pivot and the hook 6 being loosely secured to said link,the entire grooved edges 6* and e will contact with the stanchion B andform an efficient and even clamp, by exerting a downward pressure on thelever e the pivot 6 will act as a fulcrum, the arms 6 and a beingjforced upward against the under side of the base plate a therebyextending the parallel uprights a and a of the shore with relation tothe fixed stanchion B. By constructing the clamping member of two selfadjusting parts, namely the hook -e and link 0 the stanchion B isprotected from the nicking and bending effects that are experienced whenusing lifting jacks of the type described in patent to Roos No.1,415,055.

Obviously many changes may be made the device without departing from thespirit of my invention and I claim as within the scope of myinventionall devices readable on the claims that will be finally allowed.

I claim as my invention and desire to secure by Letters Patent of theUnited States:

1. A jacking device for use when adjusting extensible shores comprisingtwo separate gripping jaw members, and a lever directly secured by apivot to one of said gripping jaw members, said jack being completelyremovable from said shore upon releasing the grip of its jaws thereon.

ing extensible shores, comprising two grip-' ping jaw members pivotedtogether and a ever directly pivoted to one of said gripping jawmembe'rs.

3. A jacking deviee for use when extending adjustable shores, comprisinga forked leverthe free ends of whose fork are adapted to bear upon thetelescoping end of the movable member of the shore, two-separategripping jaws adapted to engage a contiguous portion of the stationaryelement of the shore, said gripping jaws pivoted to each other, and oneof said grippin jaw members fulcrumed to said forked ever. 1

4. A jacking device for use when extending adjustable shores, comprisinga forked lever the free ends of whose fork are adapted to bear upon thetelescoping end of the movable member of the shore, two separategripping jaws adapted to engage a'contiguous portion of the stationaryelement of the shore, said gripping jaws pivoted to'each other, and oneof said gripping jaw members pivoted to .said forked lever.

5. A jacking device for use when extending adjustable shores,oomprising'a forked lever the free ends of whose fork are adapted tobear upon the telescoping ends of the movable member of the shore, a- Tshaped member whose top is pivoted within the fork of said lever and.the free end of whose upright isadapted to act as a ripping jaw, and agripping hook pivoted to said T shaped member in proximity to itsgripping jaw so that said gripping hook and gripping jaw will coact toclamp upon the statlonary element of the shore.

6. A jacking device for use when adjusting extensible shores having arelatively fixed part below and a relatively movablepart above,comprising a lever, a clampin element pivoted to said lever, nd a seconclamping element pivoted to t e first mentioned clamping element, saidclamping ele -\ments adapted to coact in gripping" the rela- -tijvelyfixed part of the shore to be adjusted.

'- 7. A jackmg'device for use when adjusting extensible shores having arelatively fixed art below and a relatively movable part a ove,comprising a lever having a prying foot portion, a clamping elementpivoted to said lever and a second clamping element pivoted to thefirstmentioned clamping element, said clampin elements adapted to 'coactin gripping t e relatively fixed part of the shore to be adjusted andhold it while the pressure exerted upon the lever handle causes theforce exerted thru the prying foot to change the relative longitudinalposition of the s ore elements. J

8. For use in adjusting telescopically extensible shores composed of twoelements, one of which has a metal column; a removable jacking devicecomprising two separate In hand.

y GEORGE W. MEYER.

